diff options
Diffstat (limited to 'os/hal/platforms/AT91SAM7/i2c_lld.h')
| -rw-r--r-- | os/hal/platforms/AT91SAM7/i2c_lld.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/os/hal/platforms/AT91SAM7/i2c_lld.h b/os/hal/platforms/AT91SAM7/i2c_lld.h new file mode 100644 index 000000000..8e22acaf6 --- /dev/null +++ b/os/hal/platforms/AT91SAM7/i2c_lld.h @@ -0,0 +1,204 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+/*
+ Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+ aka barthess.
+ */
+
+/**
+ * @file AT91SAM7/i2c_lld.h
+ * @brief AT91SAM7 I2C subsystem low level driver header.
+ *
+ * @addtogroup I2C
+ * @{
+ */
+
+#ifndef _I2C_LLD_H_
+#define _I2C_LLD_H_
+
+#if HAL_USE_I2C || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+/**
+ * @brief Peripheral clock frequency.
+ */
+#define I2C_CLK_FREQ ((STM32_PCLK1) / 1000000)
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @name Configuration options
+ * @{
+ */
+/**
+ * @brief I2C1 driver enable switch.
+ * @details If set to @p TRUE the support for I2C1 is included.
+ * @note The default is @p FALSE.
+ */
+#if !defined(SAM7_I2C_USE_I2C1) || defined(__DOXYGEN__)
+#define SAM7_I2C_USE_I2C1 FALSE
+#endif
+
+/**
+ * @brief I2C1 interrupt priority level setting.
+ */
+#if !defined(SAM7_I2C_I2C1_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define SAM7_I2C_I2C1_IRQ_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 2)
+#endif
+
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/** @brief error checks */
+#if !SAM7_I2C_USE_I2C1
+#error "I2C driver activated but no I2C peripheral assigned"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Type representing I2C address.
+ */
+typedef uint16_t i2caddr_t;
+
+/**
+ * @brief I2C Driver condition flags type.
+ */
+typedef uint32_t i2cflags_t;
+
+/**
+ * @brief Driver configuration structure.
+ */
+typedef struct {
+ /**
+ * @brief CWGR regitster content.
+ */
+ uint32_t cwgr;
+} I2CConfig;
+
+/**
+ * @brief Type of a structure representing an I2C driver.
+ */
+typedef struct I2CDriver I2CDriver;
+
+/**
+ * @brief Structure representing an I2C driver.
+ */
+struct I2CDriver{
+ /**
+ * @brief Driver state.
+ */
+ i2cstate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const I2CConfig *config;
+ /**
+ * @brief Error flags.
+ */
+ i2cflags_t errors;
+ /**
+ * @brief Pointer to receive buffer.
+ */
+ uint8_t *rxbuf;
+ /**
+ * @brief Pointer to transmit buffer.
+ */
+ const uint8_t *txbuf;
+ /**
+ * @brief Bytes count to be received.
+ */
+ size_t rxbytes;
+ /**
+ * @brief Bytes count to be transmitted.
+ */
+ size_t txbytes;
+#if I2C_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+#if CH_USE_MUTEXES || defined(__DOXYGEN__)
+ /**
+ * @brief Mutex protecting the bus.
+ */
+ Mutex mutex;
+#elif CH_USE_SEMAPHORES
+ Semaphore semaphore;
+#endif
+#endif /* I2C_USE_MUTUAL_EXCLUSION */
+#if defined(I2C_DRIVER_EXT_FIELDS)
+ I2C_DRIVER_EXT_FIELDS
+#endif
+ /* End of the mandatory fields.*/
+ /**
+ * @brief Thread waiting for I/O completion.
+ */
+ Thread *thread;
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/**
+ * @brief Get errors from I2C driver.
+ *
+ * @param[in] i2cp pointer to the @p I2CDriver object
+ *
+ * @notapi
+ */
+#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if !defined(__DOXYGEN__)
+#if SAM7_I2C_USE_I2C1
+extern I2CDriver I2CD1;
+#endif
+
+#endif /* !defined(__DOXYGEN__) */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void i2c_lld_init(void);
+ void i2c_lld_start(I2CDriver *i2cp);
+ void i2c_lld_stop(I2CDriver *i2cp);
+ msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
+ const uint8_t *txbuf, size_t txbytes,
+ uint8_t *rxbuf, size_t rxbytes,
+ systime_t timeout);
+ msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
+ uint8_t *rxbuf, size_t rxbytes,
+ systime_t timeout);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_I2C */
+
+#endif /* _I2C_LLD_H_ */
+
+/** @} */
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